|
| |
| Soil |
|
| |
|
The general and average soil character of
cultivable land in these districts is mainly alluvial and composed of
mixture of sand (coarse to fine) and clay in varying proportions. The
general geochemical characteristics of the soil is highly acidic. However,
new alluvial soils formed due to inundation of land by river at intervals
contain more percentages of fine sand fine silt and are less acidic. Such
soils are often neutral and even alkaline. Large expanse of low-lying land
characterized by heavy clayish soil with a high percentage of nitrogen is
good for rice cultivation. Abundant rainfall and excessive humidity through
out the year also greatly favor cultivation of rice in the district .The
soil around the Subansiri and Ranganadi rivers are sandy coated with silt
which is good for cultivation of winter crops, such as raga, and mustard,
potato etc.
The soils of this district can be broadly
classified into three different zones viz. The foothill soils, active flood
plain soils near the river Bramhaputra and the low-lying marshy lands. A
more detailed description is given below:
|
|
ZONES |
DESCRIPTION |
Taxonomic
Name |
|
Piedmont |
Deep, well drained, loamy
sand/sandy loam soils occurring on very gently sloping piedmont plain having
loamy surface with moderate erosion and slight flood hazard
Associated with deep, well
drained, coarse silty soils occurring on very gently sloping concave plains
having loamy surface with slight erosion and moderate flood hazard. |
Coarse loamy, typic
fluvaquents,
Coarse silty,
Typic Haplaquents |
|
Flood
plain |
Deep, well drained, loamy
sand/sandy loam soils occurring on very gently sloping flood plain, having
loamy surface with moderate erosion and moderate flood hazard,
Associated with very deep,
moderately well drained, clay loam or sandy clay loam soils occurring on
level to nearly level flood plains with slight erosion and moderate flood
hazard. |
Coarse loamy,
Aeric fluvaquents,
Fine loamy,
Typic Haplaquepts |
|
Marshy lands |
|
|
|
at